I wonder what your take would be on my AL group's inter-session communications. We have a group chat going called "stories in the night" which are meant to be things the characters (and NPCs, sometimes) chatted about during a meal or around a campfire. Everyone--including GM--just chimes in with whatever they want to write up.
Things mentioned there might end up being really important, might be important only if the party decides to make something of it, or might be completely unimportant.